Amphastar Pharmaceuticals (AMPH) Stock Chart & Stock Price History $26.75 +0.23 (+0.87%) Closing price 10/3/2025 04:00 PM EasternExtended Trading$27.18 +0.43 (+1.61%) As of 10/3/2025 04:48 PM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Chart Stock AnalysisAnalyst ForecastsChartCompetitorsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Amphastar Pharmaceuticals Stock Price Performance The Amphastar Pharmaceuticals (AMPH) stock chart highlights key performance trends across multiple timeframes. Over the last 12 months, the stock's price has decreased 42.74%, with a year-to-date return of -27.96%. In the past month, the stock has decreased 9.08%, reflecting recent market activity. As of the latest close, Amphastar Pharmaceuticals traded at $26.75 with a market cap of $1.24 billion and volume of 331,099 shares. Five years ago, the stock traded at $20.21, representing a 32.36% increase over that period. At the time, it had a market cap of $959.69 million and a volume of 185,171 shares. Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. Subscribe Now View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. 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Read our full terms of service and privacy policy. 5 Day Performance-0.89%1 Month Performance-9.08%3 Month Performance+15.43%Year-To-Date Performance-27.96%1 Year Performance-42.74%5 Year Performance+32.36% AMPH Stock Chart for Monday, October, 6, 2025 AMPH Chart by TradingView Amphastar Pharmaceuticals Stock Price History Daily Weekly Monthly Yearly Time Frame Custom Range 1 Month 3 Months 6 Months Year-to-Date 1 Year 3 Year 5 Year Time Frame Start Date End Date Export to Excel DateOpening PriceClosing PriceHighLowVolumeMarket Capitalization10/03/2025$26.52$26.75+0.87%$27.31$26.46331,099 shs$1.24 billion10/02/2025$26.99$26.52-1.74%$27.03$26.46288,366 shs$1.23 billion10/01/2025$26.65$26.99+1.28%$27.39$26.74337,093 shs$1.25 billion09/30/2025$26.92$26.65-1.00%$27.27$26.47392,172 shs$1.24 billion09/29/2025$26.85$26.92+0.26%$27.21$26.35513,361 shs$1.25 billion09/26/2025$26.36$26.85+1.86%$26.92$26.34291,264 shs$1.25 billion09/25/2025$26.87$26.36-1.90%$26.89$25.95565,979 shs$1.23 billion09/24/2025$27.41$26.87-1.97%$27.62$26.78302,731 shs$1.25 billion09/23/2025$27.89$27.41-1.72%$28.22$27.21323,932 shs$1.27 billion09/22/2025$27.64$27.89+0.90%$28.24$27.61424,676 shs$1.30 billion Get the Latest News and Ratings for AMPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 09/19/2025$27.44$27.64+0.73%$27.77$26.871.38 million shs$1.28 billion09/18/2025$26.98$27.44+1.70%$27.70$26.90458,903 shs$1.28 billion09/17/2025$27.00$26.98-0.07%$27.90$26.57920,909 shs$1.25 billion09/16/2025$27.27$27.00-0.99%$27.51$26.87497,864 shs$1.26 billion09/15/2025$28.06$27.27-2.82%$28.39$27.23422,795 shs$1.30 billion09/12/2025$28.68$28.06-2.16%$28.86$27.91273,491 shs$1.30 billion09/11/2025$28.40$28.68+0.99%$28.89$28.36422,254 shs$1.33 billion09/10/2025$29.33$28.40-3.17%$29.26$28.34297,838 shs$1.32 billion09/09/2025$29.26$29.33+0.24%$29.43$28.99379,382 shs$1.36 billion09/08/2025$29.42$29.26-0.54%$29.41$28.49385,596 shs$1.36 billion09/05/2025$29.19$29.42+0.79%$29.78$28.98414,943 shs$1.37 billion Related Companies TGTX Stock Chart MENS Stock Chart PTCT Stock Chart KRYS Stock Chart ACLX Stock Chart ARWR Stock Chart PCVX Stock Chart ACAD Stock Chart PTGX Stock Chart ADMA Stock Chart Receive AMPH Stock News and Ratings via EmailSign-up to receive the latest news and ratings for Amphastar Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 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